M451通过I2C实现收发

发表于 2017-7-19 19:47

/**************************************************************************//**

 * [url=home.php?mod=space&uid=288409]@file[/url]     main.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V0.10

 * $Revision: 12 $

 * $Date: 15/09/02 10:04a $

 * @brief

 *           Configure SPI1 as I2S Master mode and demonstrate how I2S works in Master mode.

 *           This sample code needs to work with I2S_Slave.

 * @note

 * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.

 *

 ******************************************************************************/

#include <stdio.h>

#include <string.h>

#include "M451Series.h"



#define PLL_CLOCK           72000000



uint32_t g_u32TxValue;

uint32_t g_u32DataCount;



/* Function prototype declaration */

void SYS_Init(void);



/*---------------------------------------------------------------------------------------------------------*/

/*  Main Function                                                                                          */

/*---------------------------------------------------------------------------------------------------------*/

int32_t main(void)

{

    uint32_t u32RxValue1, u32RxValue2;



    /* Unlock protected registers */

    SYS_UnlockReg();

    /* Init System, IP clock and multi-function I/O. */

    SYS_Init();

    /* Lock protected registers */

    SYS_LockReg();



    /* Reset UART0 module */

    SYS_ResetModule(UART0_RST);

    /* Init UART0 to 115200-8n1 for printing messages */

    UART_Open(UART0, 115200);



    printf("+-----------------------------------------------------------+\n");

    printf("|            I2S Driver Sample Code (master mode)           |\n");

    printf("+-----------------------------------------------------------+\n");

    printf("  I2S configuration:\n");

    printf("      Sample rate 16 kHz\n");

    printf("      Word width 16 bits\n");

    printf("      Stereo mode\n");

    printf("      I2S format\n");

    printf("      TX value: 0x55005501, 0x55025503, ..., 0x55FE55FF, wraparound\n");

    printf("  The I/O connection for I2S1 (SPI1):\n");

    printf("      I2S1_LRCLK (PA4)\n      I2S1_BCLK(PA7)\n");

    printf("      I2S1_DI (PA6)\n      I2S1_DO (PA5)\n\n");

    printf("  NOTE: Connect with a I2S slave device.\n");

    printf("        This sample code will transmit a TX value 50000 times, and then change to the next TX value.\n");

    printf("        When TX value or the received value changes, the new TX value or the current TX value and the new received value will be printed.\n");

    printf("  Press any key to start ...");

    getchar();

    printf("\n");



    /* Master mode, 16-bit word width, stereo mode, I2S format. Set TX and RX FIFO threshold to middle value. */

    I2S_Open(SPI1, I2S_MODE_MASTER, 16000, I2S_DATABIT_16, I2S_STEREO, I2S_FORMAT_I2S);



    /* Initiate data counter */

    g_u32DataCount = 0;

    /* Initiate TX value and RX value */

    g_u32TxValue = 0x55005501;

    u32RxValue1 = 0;

    u32RxValue2 = 0;

    /* Enable TX threshold level interrupt */

    I2S_EnableInt(SPI1, I2S_FIFO_TXTH_INT_MASK);

    NVIC_EnableIRQ(SPI1_IRQn);



    printf("Start I2S ...\nTX value: 0x%X\n", g_u32TxValue);



    while(1)

    {

        /* Check RX FIFO empty flag */

        if((SPI1->I2SSTS & SPI_I2SSTS_RXEMPTY_Msk) == 0)

        {

            /* Read RX FIFO */

            u32RxValue2 = I2S_READ_RX_FIFO(SPI1);

            if(u32RxValue1 != u32RxValue2)

            {

                u32RxValue1 = u32RxValue2;

                /* If received value changes, print the current TX value and the new received value. */

                printf("TX value: 0x%X;  RX value: 0x%X\n", g_u32TxValue, u32RxValue1);

            }

        }

        if(g_u32DataCount >= 50000)

        {

            g_u32TxValue = 0x55005500 | ((g_u32TxValue + 0x00020002) & 0x00FF00FF); /* g_u32TxValue: 0x55005501, 0x55025503, ..., 0x55FE55FF */

            printf("TX value: 0x%X\n", g_u32TxValue);

            g_u32DataCount = 0;

        }

    }

}



void SYS_Init(void)

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init System Clock                                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/



    /* Enable HIRC clock */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Enable HXT clock (external XTAL 12MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);



    /* Wait for HXT clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);



    /* Configure PLL */

    CLK_EnablePLL(CLK_PLLCTL_PLLSRC_HXT, PLL_CLOCK);



    /* Switch HCLK clock source to PLL */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL, CLK_CLKDIV0_HCLK(1));



    /* Select UART module clock source as HXT and UART module clock divider as 1 */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));



    /* Select PCLK1 as the clock source of SPI1 */

    CLK_SetModuleClock(SPI1_MODULE, CLK_CLKSEL2_SPI1SEL_PCLK1, MODULE_NoMsk);



    /* Enable peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(SPI1_MODULE);



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CyclesPerUs automatically. */

    SystemCoreClockUpdate();





    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Set PD multi-function pins for UART0 RXD and TXD */

    SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);

    SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);



    /* Configure SPI1 related multi-function pins. */

    /* GPA[7:4] : SPI1_CLK (I2S1_BCLK), SPI1_MISO (I2S1_DI), SPI1_MOSI (I2S1_DO), SPI1_SS (I2S1_LRCLK). */

    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA4MFP_Msk | SYS_GPA_MFPL_PA5MFP_Msk | SYS_GPA_MFPL_PA6MFP_Msk | SYS_GPA_MFPL_PA7MFP_Msk);

    SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA4MFP_SPI1_SS | SYS_GPA_MFPL_PA5MFP_SPI1_MOSI | SYS_GPA_MFPL_PA6MFP_SPI1_MISO | SYS_GPA_MFPL_PA7MFP_SPI1_CLK);



}



void SPI1_IRQHandler()

{

    /* Write 2 TX values to TX FIFO */

    I2S_WRITE_TX_FIFO(SPI1, g_u32TxValue);

    I2S_WRITE_TX_FIFO(SPI1, g_u32TxValue);

    g_u32DataCount += 2;

}



/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/

发表于 2017-7-19 19:47

复制

/**************************************************************************//**

 * @file     main.c

 * @version  V0.10

 * $Revision: 11 $

 * $Date: 15/09/02 10:04a $

 * @brief

 *           Configure SPI1 as I2S Slave mode and demonstrate how I2S works in Slave mode.

 *           This sample code needs to work with I2S_Master.

 * @note

 * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.

 *

 ******************************************************************************/

#include <stdio.h>

#include <string.h>

#include "M451Series.h"



#define PLL_CLOCK           72000000



uint32_t g_u32TxValue;

uint32_t g_u32DataCount;



/* Function prototype declaration */

void SYS_Init(void);



/*---------------------------------------------------------------------------------------------------------*/

/*  Main Function                                                                                          */

/*---------------------------------------------------------------------------------------------------------*/

int32_t main(void)

{

    uint32_t u32RxValue1, u32RxValue2;



    /* Unlock protected registers */

    SYS_UnlockReg();

    /* Init System, IP clock and multi-function I/O. */

    SYS_Init();

    /* Lock protected registers */

    SYS_LockReg();



    /* Reset UART0 module */

    SYS_ResetModule(UART0_RST);

    /* Init UART0 to 115200-8n1 for printing messages */

    UART_Open(UART0, 115200);



    printf("+----------------------------------------------------------+\n");

    printf("|            I2S Driver Sample Code (slave mode)           |\n");

    printf("+----------------------------------------------------------+\n");

    printf("  I2S configuration:\n");

    printf("      Word width 16 bits\n");

    printf("      Stereo mode\n");

    printf("      I2S format\n");

    printf("      TX value: 0xAA00AA01, 0xAA02AA03, ..., 0xAAFEAAFF, wraparound\n");

    printf("  The I/O connection for I2S1 (SPI1):\n");

    printf("      I2S1_LRCLK (PA4)\n      I2S1_BCLK(PA7)\n");

    printf("      I2S1_DI (PA6)\n      I2S1_DO (PA5)\n\n");

    printf("  NOTE: Connect with a I2S master.\n");

    printf("        This sample code will transmit a TX value 50000 times, and then change to the next TX value.\n");

    printf("        When TX value or the received value changes, the new TX value or the current TX value and the new received value will be printed.\n");

    printf("  Press any key to start ...");

    getchar();

    printf("\n");



    /* Slave mode, 16-bit word width, stereo mode, I2S format. Set TX and RX FIFO threshold to middle value. */

    /* I2S peripheral clock rate is equal to PCLK1 clock rate. */

    I2S_Open(SPI1, I2S_MODE_SLAVE, 0, I2S_DATABIT_16, I2S_STEREO, I2S_FORMAT_I2S);



    /* Initiate data counter */

    g_u32DataCount = 0;

    /* Initiate TX value and RX value */

    g_u32TxValue = 0xAA00AA01;

    u32RxValue1 = 0;

    u32RxValue2 = 0;

    /* Enable TX threshold level interrupt */

    I2S_EnableInt(SPI1, I2S_FIFO_TXTH_INT_MASK);

    NVIC_EnableIRQ(SPI1_IRQn);



    printf("Start I2S ...\nTX value: 0x%X\n", g_u32TxValue);



    while(1)

    {

        /* Check RX FIFO empty flag */

        if((SPI1->I2SSTS & SPI_I2SSTS_RXEMPTY_Msk) == 0)

        {

            /* Read RX FIFO */

            u32RxValue2 = I2S_READ_RX_FIFO(SPI1);

            if(u32RxValue1 != u32RxValue2)

            {

                u32RxValue1 = u32RxValue2;

                /* If received value changes, print the current TX value and the new received value. */

                printf("TX value: 0x%X;  RX value: 0x%X\n", g_u32TxValue, u32RxValue1);

            }

        }

        if(g_u32DataCount >= 50000)

        {

            g_u32TxValue = 0xAA00AA00 | ((g_u32TxValue + 0x00020002) & 0x00FF00FF); /* g_u32TxValue: 0xAA00AA01, 0xAA02AA03, ..., 0xAAFEAAFF */

            printf("TX value: 0x%X\n", g_u32TxValue);

            g_u32DataCount = 0;

        }

    }

}



void SYS_Init(void)

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init System Clock                                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/



    /* Enable HIRC clock */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Enable HXT clock (external XTAL 12MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);



    /* Wait for HXT clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);



    /* Configure PLL */

    CLK_EnablePLL(CLK_PLLCTL_PLLSRC_HXT, PLL_CLOCK);



    /* Switch HCLK clock source to PLL */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL, CLK_CLKDIV0_HCLK(1));



    /* Select UART module clock source as HXT and UART module clock divider as 1 */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));



    /* Select PCLK1 as the clock source of SPI1 */

    CLK_SetModuleClock(SPI1_MODULE, CLK_CLKSEL2_SPI1SEL_PCLK1, MODULE_NoMsk);



    /* Enable peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(SPI1_MODULE);



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CyclesPerUs automatically. */

    SystemCoreClockUpdate();



    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Set PD multi-function pins for UART0 RXD and TXD */

    SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);

    SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);



    /* Configure SPI1 related multi-function pins. */

    /* GPA[7:4] : SPI1_CLK (I2S1_BCLK), SPI1_MISO (I2S1_DI), SPI1_MOSI (I2S1_DO), SPI1_SS (I2S1_LRCLK). */

    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA4MFP_Msk | SYS_GPA_MFPL_PA5MFP_Msk | SYS_GPA_MFPL_PA6MFP_Msk | SYS_GPA_MFPL_PA7MFP_Msk);

    SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA4MFP_SPI1_SS | SYS_GPA_MFPL_PA5MFP_SPI1_MOSI | SYS_GPA_MFPL_PA6MFP_SPI1_MISO | SYS_GPA_MFPL_PA7MFP_SPI1_CLK);



}



void SPI1_IRQHandler()

{

    /* Write 2 TX values to TX FIFO */

    I2S_WRITE_TX_FIFO(SPI1, g_u32TxValue);

    I2S_WRITE_TX_FIFO(SPI1, g_u32TxValue);

    g_u32DataCount += 2;

}



/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/

发表于 2017-7-19 20:02

I2S_Open(SPI1, I2S_MODE_SLAVE, 0, I2S_DATABIT_16, I2S_STEREO, I2S_FORMAT_I2S);
I2S_Open(SPI1, I2S_MODE_MASTER, 16000, I2S_DATABIT_16, I2S_STEREO, I2S_FORMAT_I2S);
这两个才是关键，搞两个例子，看晕人。

发表于 2017-7-19 20:05

有时候关键点就是那么一点。

发表于 2017-7-19 20:17

上面分析的很到位，好多功能选择就是一个参数。

发表于 2017-7-19 22:15

看来要好好总结总结这些使用方法了。

发表于 2017-7-20 15:18

搞懂原理了就都简单了。

发表于 2017-7-24 21:11

I2C这种接口的外部芯片也是非常多的。

[DemoCode下载] M451通过I2C实现收发

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